\\[-1.8ex] Soil Heterogeneity & $-$0.113 & $-$0.027 & $-$0.047 & $-$0.050$^{*}$ & $-$0.049$^{*}$ & $-$0.047 \\ 
  & (0.070) & (0.030) & (0.030) & (0.030) & (0.029) & (0.029) \\ 
\\[-1.8ex] 
Observations & 62,905 & 62,905 & 62,905 & 62,905 & 62,905 & 62,902 \\ 
R$^{2}$ & 0.001 & 0.340 & 0.340 & 0.341 & 0.341 & 0.341 \\ 
